Edward weston



(No Model.)

E. WESTON. ELECTRICAL METER. No. 283,547. Patented Aug. 21, 1883.

LU k if i E Q- im@ k I [fwerzZU/'f IINiri-:n STATES ATENT OFFICE.,

EDVARD VESTON, OE NEVARK, EEV JERSEY, ASSIGNOR TO THE UNITED STATES ELECTRIC LIGHTING COMPANY, OE NEV YORK, N. Y.

ELECTRICAL METER.. j

SPECIFICATION forming part of Letters Patent-No. 283,547, dated August 21, 1883.

Application filed March E13, 1883.

To @ZZ whom it may concern,.-

Be it known that I, EDWARD Wns'roma subject of the Queen of Great Britain, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Electrical Meters, of which the following is a specification, reference being had to the drawing accompanying and forming a part of the same.

The object of my invention is to provide an apparatus for measuring and recording the iiow of current in a circuit, or in any branch ofa circuit, the object being more especially to obtain a record of current in a system for running incandescent electric lamps, wherein the lamps are included in multiple or derived circuits from the main conductors. To accomplish this I employ an electro-magnetic motor in conjunction with a recording mechanisin for indicating 'the number of revolutions made by the motor in a given time, and this motor I so arrange with reference to the circuit in which the iiow of current is to be ascertained that its speed will at all times be proportioned to the iiow. This will be explained by reference to the drawing, which is a diagrammatic illustration of a part of an electric-lighting system, illustrating the means invented by me of measuring the iiow of current. y

Let A designate any electrical generator; B B, conductors leading from the same to desired points; C C,a branch circuit from the main conductors, and D D a given number of incandescent lamps or similar devices included in multiple arc with the branch circuits.V

If it be desired to lobtain a record of the current that is drawn from the main line for running the lamps D, I employ an electromagnetic lmotor, E, to the shaft of which is properly geared a register, G, to indicate the number of turns made by said shaft. The

field of this motor I include in one branch of the circuit C C. The armature is included in a circuit, E F, between the conductors of the circuit C C. The resist-ance of the eldcircuit of the motor is so low as not to affect,

(No model.)

`to an appreciable degree, the resistance or the circuit C C. The armature-circuit, on the y contrary, is of quite high resistance, so that it absorbs but little current. 'When thus arranged the motor and register operate as a current-meter, inasmuch as the following conditions obtain: The speed of the armature, other things being equal, depends upon the intensity of field magnetism. In this case, the intensity of the iield depending directly on the number of lamps D, the speed would be an indication of the current iiowing, provided that no disturbing causes exist. That such is the case is evident from the fact that the resistance of circuit E E never varies, while the pressure or electro-motive force in the main circuit remains always constant. The amount of current that iiows through'circuit E would be always the same, therefore, but for the counter electro-motive force produced by the motor. This is, however, directly proportioned to the speed, so that the ratio of speed to current flowing is always the same-given increments of currents, in other words, producing given increments in the speed of the motor.l The retarding effects of friction and resistance of the air in the case of a motor used in this manner I have found to be so small that they may, for practical purposes, be disregarded.

It is of course essential that the electromotive force in the circuits B B or C C be constant, which may be either donc by a properly-constructed machine, or by the employment of regulating mechanism.

I am aware that motors have heretofore been employed in combination with registers, and that the same, when combined with devices for imposing a load upon the motor, have been employed as meters. I am not, however, aware 'that an unloaded motor has been used in the manner described, and

Vhat I therefore claim is- 1. The combination, with a main circuit and multiple-arc or derived circuits, of a motor anda register for indicating the number of revolutions of the same, the eld of the motor being included in the main circuit and the armature in one of the multiple-avro or or derived circuits, as and for the purpose set derived circuits, as and for the purpose Set forth. ro forth. In testimony whereof I have hereunto set 2. The combination, with :t 11min Circuit my hand this 21st day of March, 1883.. 5 and multiple-arc or derived circuits, of 2L eo1n- EDWARD W'ESTO.

billed register and unloaded lno'for7 the field Vtnesses: of said motor being included in the main cir- HENRY A. BECKMEYER, cuit and the armature in one of the multiple L. V. E. INNES. 

